Improvement in plane-irons



H. DISSTON.

PLANE-1R0. I No.181,649. Patented Aug-29.1876.

N.PE TER$. PHDTQ-LITHOGRAPHER, WASHINGTON. D C- UNITED STATES PATENTOFFICE.

HENRY DISSTON, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN PLAN E-IRONS.

Specification forming part of Letters Patent No. 181.649, dated August29, 1876; application filed April 29, 1876.

To all whom it may concern:

Be it known that I, HENRY DISSTON, of

-. Philadelphia, Pennsylvania, have invented certain Improvements inPlane-Irons, of which the following is a specification The object of myinvention is to so construct a plane-bit that it may be more readily andtruly ground and sharpened than ordinary edge-tools of this class, afurther object of my invention being economy in the consumption ofmaterial in making the tools.

In the accompanying drawing, Figure 1 represents a front view of aplane-bit made according to my invention Fig. 2, a section on the line 12; Fig. 3, a transverse section on the line 3 4; Fig. 4, a modificationof Fig. 3. The plane-bit A (shown in Figs. 1, 2, and 3) has a series ofparallel grooves or indentations, a, on thatside from which the tool isbeveled to a sharp edge, the grooves being of such a depth that theywill extend into the beveled portion d, as shown. With the exception ofthese grooves or indentations the planebit is similar to those ofordinary construction and, as it is no thicker than usual, the ribsbetween the grooves impart the desired rigidity, while less material isconsumed in its manufacture than in making common its.

The grinding of the beveled edge of a bit thus constructed can be morereadily accomthe two dies being used in connection with any ordinarydroppress.

It is not essential that the indentations or grooves and interveningribs should be of the precise shape shown in the sectional view, Fig. 3.They may, for instance, be of the form shown in Fig. 4, with goodresults as regards the facility of grinding, sharpening, and economizingot'material.

I claim as my invention- As a new article of manufacture, a planebithaving grooves or indentations on its beveled side, as specified.

In testimony whereofI have signed my name to this specification in thepresence of two subscribing witnesses.

, HENRY DISSTON.

Witnesses:

A. H. SHOEMAKER, Gno. S. GAUDY.

